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# If the formula above gives the area A of a circular region in terms of

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Math Expert
Joined: 02 Sep 2009
Posts: 51121
If the formula above gives the area A of a circular region in terms of  [#permalink]

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23 Nov 2017, 22:26
00:00

Difficulty:

35% (medium)

Question Stats:

87% (00:58) correct 13% (02:25) wrong based on 24 sessions

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$$A = \frac{\pi d^2}{x}$$

If the formula above gives the area A of a circular region in terms of its diameter d, then x =

(A) 1/4
(B) 1/2
(C) 1
(D) 2
(E) 4

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Joined: 15 Oct 2017
Posts: 30
Location: Ireland
Concentration: Healthcare, Finance
Re: If the formula above gives the area A of a circular region in terms of  [#permalink]

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24 Nov 2017, 01:46
$$A =\frac{\pi * d^2}{x} ; d = 2*r$$ ;
$$\frac{\pi * d^2}{x}$$ = $$\pi * r^2$$ ;
$$\frac{\pi * 4r^2}{x}$$ =$$\pi*r^2$$ ;
$$\pi * 4r^2 = x* \pi * r^2$$
$$x=4$$

Re: If the formula above gives the area A of a circular region in terms of &nbs [#permalink] 24 Nov 2017, 01:46
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